At the time though, the youthful Tehrani population, lacking bars and nightclubs, took full advantage of the fun. Here is a video of a group of boys who make fun of both Ahmadinejad and Moussavi.
Here is another video of young people enjoying themselves. Normally playing music loudly on the street and especially that sort of dancing wouldn't be allowed.
I guess since a monthly gas stipend is provided for free from the government, people felt fine about sitting in traffic to make a point!
If you're interested in a transcript of the videos, or would like to see more videos (I have a ton!) please comment and let me know.